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The altercation quickly became violent, with Paterson attacking the victim's friend, 25, by striking him on the head with a bottle. Paterson then used the smashed bottle to slash the female victim's face and neck, resulting in serious facial injuries.

A staff member alerted the British Transport Police and police officers after witnessing the horrific attack, who then boarded the service to attend to the victim.

Paterson was arrested soon after the incident and was taken into police custody before being charged with two counts of serious assault. She attended Kilmarnock Sherriff Court where she pleaded guilty to the charge.

Lead investigator Detective Sergeant Marc Francey, said: "Paterson’s actions on that train were shockingly violent and dangerous. She struck her victim with a broken glass bottle which caused some extremely nasty cuts requiring stitching. Thankfully the cuts have now all healed but the psychological trauma of this will stay with her indefinitely.

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"There is no place for this sort of behaviour on the rail network and we will work tirelessly to ensure that violence is deterred and offenders are brought before the courts.

"Paterson will spend the next three years behind bars for her extremely reckless and vicious behaviour, plenty of time for her to reflect on these actions."

A ScotRail Alliance spokesperson, said: "We do not tolerate violence or abuse of any kind towards our customers or staff. We are thankful that the perpetrator of this attack has been brought to justice."